JPH05797A - Electric lifting device - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the rope 4 is slackened, the rope 4 is surely wound around the winding drum 3. Prevents a failure in lifting and lowering due to the entanglement of the rope 4 and a fall accident due to the cutting of the rope 4. [Structure] The winding drum 3 has a drum portion for winding the cord 4 and flanges 8 on both sides of the drum portion. A guide portion 9 for guiding the cord 4 toward the inside of the drum portion is provided on the periphery of the collar portion 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lifting device for moving up and down electric equipment such as lighting equipment and speakers installed in a high place such as a ceiling of a gymnasium or a factory.

[0002]

2. Description of the Related Art Electrical equipment installed in a high place such as a gymnasium or the ceiling of a factory is provided so that it can be raised and lowered so that maintenance and inspection can be easily performed.

In a conventional electric lifting device, a lifting device main body is installed on a ceiling or the like, and an electric motor and a winding drum for winding and winding a cord by forward and reverse rotation driving of the electric motor are arranged in the lifting device main body. An elevating part equipped with an electric device is connected to the cord extended from the winding drum.

The winding drum has a drum portion for winding the cord and flange portions on both sides of the drum portion. The peripheral surface of the flange portion of the winding drum is formed into a plane perpendicular to the side surface of the flange portion, and the side surface is angled.

Further, when the elevating part reaches the floor surface or the like when the elevating part descends and a slack is generated in a cord fed from the winding drum, the slack of the cord is detected and the electric motor is stopped. Equipped with slack detection means.

[0006]

By the way, as described above, when the elevating part reaches the floor surface or the like when the elevating part descends and the slack is generated in the cord fed out from the winding drum,
Although the slack of the cord is detected by the slack detecting means to stop the electric motor, in this state, the slack may occur in a state where the cord extends outside the flange portion of the winding drum.

From this state, when the take-up drum is rotated in the take-up direction to raise the elevating part, the rope catches on the corner of the brim and rides up to come off from the take-up drum, or to other places. When the take-up drums are adjacent to each other, the take-up drum may be entangled with the adjacent take-up drum, resulting in a failure in raising and lowering. Moreover, when the rope is entangled with the electric motor side, there is a risk that the rope is cut by the driving force of the electric motor and the lifting unit falls.

The present invention has been made in view of the above points, and even when the rope is slack, it is reliably wound around the winding drum, and the rope is entangled, causing a failure in vertical movement or a drop due to cutting. It is an object of the present invention to provide an electric lifting device that can prevent accidents.

[0009]

DISCLOSURE OF THE INVENTION The present invention is directed to a lifting / lowering device main body arranged at a fixed position, a drum portion for winding a cord and a collar on both sides of the drum portion, which is arranged in the lifting / lowering device main body. And a winding drum for winding and unwinding the filament by forward and reverse rotation, an electric motor for driving the winding drum in forward and reverse rotation, and a rope connected to the filament unwound from the winding drum. A slack detection that stops the electric motor by detecting an elevating part that moves up and down by winding and unwinding the wire, and detecting that the elevating part reaches the lower limit position and slack has occurred in the wire unwound from the winding drum. The wind-up drum is provided with a guide portion for guiding the rope toward the inside of the drum portion on the periphery of the flange portion.

[0010]

According to the present invention, when the elevating part is lowered by the rotational driving of the electric motor, the rope is fed out from the winding drum and the elevating part is lowered. When this lifting unit reaches the lower limit position for lowering,
Since the slack is generated in the rope, the slack detecting means detects this and stops the electric motor.

In order to raise the elevating part from this lowered state, the cord is wound around the winding drum by the reverse rotation drive of the electric motor, and the elevating part is raised.

By the way, when the elevating part has reached the lower limit position for lowering, the slack may occur in a state in which the cord extends outside the flange part of the winding drum. From this state, when the winding drum is rotated in the winding direction in order to raise the elevating part, the rope may be caught by the brim and ride up, and the rope may be entangled or cut.

However, since the guide portion is formed on the peripheral edge of the flange portion of the winding drum, the rope is guided into the drum portion and reliably wound up without being caught by the flange portion and riding up.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 is a main body of an elevating device, which is installed at a high place such as a ceiling of a gymnasium or a factory.

An electric motor 2 is attached to the inside of the lifting / lowering device main body 1, and a winding drum 3 is fixed to a rotary shaft that is rotated in the forward and reverse directions by the electric motor 2.

The winding drum 3 is integrally formed with a pair of winding portions 5 for winding the cord 4. Each winding unit 5
It has a drum portion 7 in which grooves 6 are formed on the circumferential surface for winding the cords 4 in an aligned manner, and flange portions 8 provided on both sides of each drum portion 7. The collar 8 located between the pair of winding units 5 is shared and functions as a partition plate.

A guide portion 9 for guiding the rope 4 toward the inside of the drum portion 7 is formed on the peripheral edge of each flange portion 8. The guide portion 9 has a tapered surface 9a formed on the collar portions 8 on both sides.
Alternatively, there is a curved surface 9b formed on the central collar portion 8.

The cord 4 is composed of one wire, and each end is connected and fixed to each winding portion 5 of the winding drum 3,
From each of the winding portions 5, slack detecting means 10, guide pulleys 11 rotatably attached to the lifting / lowering device body 1, and direction changing pulleys 12 attached to both sides of a lock case 31 described later.
It is led out below the lifting / lowering device main body 1 via.

In the slack detecting means 10, a detecting lever 14 is pivotably supported by a bracket 13 fixed to the lifting / lowering device main body 1, and a guide shaft 15 is installed between the detecting lever 14 and the tip of the detecting lever 14. The cord 4 is passed between the two and the detection lever 14
A switch 16 is provided facing the lower side of the switch 16 and operated by swinging the detection lever 14 downward. This switch 16
As will be described later, the electric motor 2 is stopped when it is operated when the elevating part 21 is descending.

The elevating part 21 is connected to the cord 4 led out below the elevating device body 1, and is elevated by the winding and unwinding operation of the cord 4. And, this lifting unit 21
A cylindrical case 22 is provided, and an electric device such as a lighting fixture and a speaker is attached to the lower surface of the case 22, and a plurality of lifting portion contacts 23 electrically connected to the electric device are provided on the upper surface so as to project from both side surfaces. A locking projection 24 is provided on the projection.

The lock case 31 is attached to the center of the lower surface of the lifting / lowering device main body 1, is formed in a box shape that opens downward, and has cutout portions 32 on both side surfaces. Both side edge portions of the cutout portion 32 are formed. Contacting the peripheral surface of the case 22 of the elevating part 21
A guide part 33 is formed to guide the elevating part 21 in parallel, and an introducing part 34 for introducing the elevating part 21 is formed in the guide part 33 so as to expand downward.

A movable plate 35 is arranged in the lock case 31, and the movable plate 35 is supported by a plurality of rods 36 provided in the lock case 31 so as to be movable up and down.
It is urged downward by a spring (not shown). The movable plate 35 has contact points for the lifting unit when the lifting unit 21 is raised.
A power supply contact 37 with which the 23 contacts is provided.

Further, between the lower portions on both sides of both the notches 32 of the lock case 31, lock claws which are engaged with and disengaged from the engaging projections 24 of the elevating part 21.
A support shaft 39 provided with 38 is installed so as to be selectively rotatable.

Next, the operation of this embodiment will be described.

When the elevating part 21 descends, the rope 4 is paid out from the winding drum 3 by driving the electric motor 2, and the elevating part 21
21 descends.

At this time, since the elevating part 21 is suspended by the cord 4, tension is applied to the cord 4. Therefore, the detection lever 14 of the slack detecting means 10 is swung upward by the rope 4, and the switch 16 is not operated.

When the elevating part 21 descends to the floor surface or the like, slack is generated in the rope 4, so that the detection lever 14 of the slack detecting means 10 swings downward and the switch 16 operates to operate the electric motor 2
Is stopped.

On the other hand, in order to raise the elevating part 21 from this lowered state, since the cord 4 is wound around the winding drum 3 by the reverse rotation drive of the electric motor 22, the elevating part 21 rises.

By the way, when the elevating part 21 reaches the floor or the like and the slack is generated in the cord 4 fed from the winding drum 3,
The slack may occur in a state where the cord 4 extends outside the flange portion 8 of the winding drum 3. From this state, when the winding drum 3 is rotated in the winding direction in order to raise the elevating part 21, the rope 4 is caught by the brim portion 8 and rides up, and there is a possibility that the rope 4 is entangled or cut. is there.

However, in this embodiment, since the taper surface 9a or the curved surface 9b is formed as the guide portion 9 on the periphery of the collar portion 8 of the winding drum 3, the cord 4 is caught on the collar portion 8 and rides up. Without being guided, it is surely wound up by being guided into the drum portion 7. Therefore, it is possible to prevent the lifting / lowering operation failure due to the entanglement of the rope 4 and the fall accident of the lifting / lowering portion 21 due to the cutting of the rope 4.

Then, the ascending / descending portion 21 comes into contact with the guide portion 33 through the introduction portion 34 of the lock case 31, the shake is suppressed, and ascends substantially in parallel. Then, the plurality of lifting / lowering part contacts 23 of the lifting / lowering part 21 contact the corresponding power supply contacts 37. When the switch (not shown) detects that the elevating part 21 has reached the fixed home position, the electric motor 2 is stopped.

When the elevating part 21 is in the fixed rising position, the elevating part 21
The lock claw 38 is engaged with the lower portion of the locking projection 24 of the 21 to allow the lifting portion 21
To prevent falling. This lock claw 38 is
It is adapted to be disengaged from the locking projection 24 when the is lowered.

[0034]

According to the present invention, even if the lifting portion reaches the lower limit position for lowering and the slack occurs in a state where the rope extends outside the flange portion of the winding drum, the peripheral edge of the flange portion of the winding drum. Since the guide portion is formed on the winding portion, when the rope is wound around the winding drum and the ascending / descending portion is lifted, the rope is guided into the drum portion and reliably wound up without being caught by the flange portion and riding up. Therefore, it is possible to prevent the lifting and lowering operation due to the entanglement of the rope and the accident of dropping the lifting portion due to the cutting of the rope.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an electric lifting device of the present invention.

FIG. 2 is a side view of the winding drum.

FIG. 3 is a perspective view of the winding drum and the elevating part.

[Explanation of symbols]

 1 Lifting device main body 2 Electric motor 3 Winding drum 4 Rope 7 Drum part 8 Collar part 9 Guide part 10 Slack detecting means 21 Lifting part

Claims (1)

Claim: What is claimed is: 1. An elevating device main body arranged at a fixed position,
A winding drum that is disposed in the main body of the lifting device, has a drum portion for winding the rope, and flanges on both sides of the drum portion, and winds and takes out the rope by forward and reverse rotation, and the winding drum. An electric motor that drives the drum to rotate forward and backward, an elevating unit that is connected to a cord fed from the winding drum and that moves up and down by winding and unwinding the cord, and the raising and lowering unit reaches a lower limit lowering position to wind the reel. And a slack detecting means for stopping the electric motor by detecting the occurrence of slack in the cord fed out from the take-up drum, the take-up drum, the take-up line toward the inside of the drum at the periphery of the flange. An electric lifting device having a guide portion for guiding.